JPH03142632A - Initial value deciding device - Google Patents

Abstract

PURPOSE:To stop and restart the operation of a control circuit without affecting the operation of a circuit to be controlled by storing the control signal right before the control circuit stops its operation and defining the stored control signal as the initial value when the control circuit is restarted. CONSTITUTION:The control circuit 33 of a 1st plug-in unit 31 supplies the con trol signal via the control terminals 36 and 37 to instruct a prescribed operation to a 2nd plug-in unit 32. An initialization circuit 34 inputs the control signals outputted to both terminals 36 and 37 via the initial value terminals 38 and 39 right before the removal of the unit 31. Then the circuit 34 initializes the circuit 33 for output of the same control signal even after the unit 31 is mounted again. The storage circuit 41 of the unit 32 stores the control signal right before the detection of the removal of the unit 31 and the stop of operation of the circuit 33 and then supplies continuously the stored control signals to a circuit 42 to be controlled. Thus, it is possible to stop and restart the operation of the circuit 33 without affecting the operation of the circuit 42.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an initial value determining device for determining an initial value when restarting various control 11 circuits after once stopping their operation.

[Conventional technology]

Generally, devices with advanced functions tend to become physically larger and more complex, making maintenance difficult. Generally, such devices are divided into a plurality of functional units for convenience in movement and transportation, and for ease of maintenance. That is, by combining a plurality of plug-in units whose circuits are configured to be removable for each predetermined function, a device having a desired function is obtained.

FIG. 4 shows a device configured with plug-in units for predetermined functions.

For example, in the case of communication, in order to ensure a high degree of reliability, a plurality of packages configured with circuits for performing predetermined processing may be arranged, and processing may be performed in parallel with these packages. In such a case, normally a signal processed by one of the packages is used, and if an abnormality occurs in this, the signal is immediately switched to the signal of the other package to maintain communication. Hereinafter, a conventional plug-in unit 7) used in such a case will be explained.

The first package 11 and the second package 12 are supplied with the same signal 13, for example an audio signal. 11th 2nd
The package 11.12 generates a signal 16.17 which has undergone the same processing as the signal 13, for example, P CM (Pulse
A Code Modulation ) signal is output. Further, these packages 11 and 12 are configured to self-monitor the processing of the signal 13, and also output a monitoring signal 18 and 19 indicating the monitoring result. Signals 16 and 17 and supervisory signals 18 and 19 are the same if the eleventh and second packages 11 and 12 are respectively normal.

The signals 16 , 17 are fed to the controlled circuit 22 of the second plug-in unit 21 . The controlled circuit 22 includes a selector circuit (not shown), and uniquely selects one of the signals 16 and 17 according to the control signal supplied from the control circuit 24 of the first plug-in unit 23. and output.

The control circuit 24 of the first plug-in unit 23 receives the monitoring signal 18.19 and sends a predetermined control signal to the terminal 2.
Output from 7.28.

FIG. 5 shows the correspondence between the control signals output by the control circuit 24 upon receiving the monitoring signals 18 and 19 and the operations performed by the controlled circuit 22 based on these control signals.

The control circuit 24 receives four different control signals “00” and “0”.
1"IO" and "11" are generated and output. On the other hand, the controlled circuit 22 performs operations A, B, and C1 in response to these control signals, respectively. For example, when the monitoring signals 18 and 19 are both normal, the control circuit 23 outputs the control signal "00". In this case, the controlled circuit 22 can select either signal 16 or 17, but
In order to uniquely determine the operation of the control circuit 24 at startup, the signal 16 supplied from the first package 11 is selected as operation A. The control circuit 24 also receives the control signal 18
．． If either one of 19 is an abnormal signal, the control signal “0”
1” or the control signal “IO”, and the controlled circuit 22
outputs a normal signal among signals 16 and 17 as operation B1C. Further, when both control signals 18 and 19 are abnormal signals, the control circuit 24 outputs the control signal "11", and the controlled circuit 22 uniquely selects the signal 16 as the operating signal.

The control signal "11" is supplied to the controlled circuit 22 with the first plug-in unit 23 removed in order to uniquely determine its operation.

For example, the control circuit 24 generates the control signal "01'",
If the first plug-in unit 23 is removed while the controlled circuit 13 is performing the corresponding operation B, the operation of the controlled circuit 22 changes to the operation. Furthermore, when the first plug-in unit 23 is reinstalled and the control circuit 24 is restarted, the controlled circuit 22 executes operation A since the initial value of the control signal is the control signal "00".

[Problem to be solved by the invention]

In such a device, when the first plug-in unit 23 in which the control circuit 24 is disposed is removed, the control signal supplied to the controlled circuit 22 may change before and after the removal. Furthermore, the initial value of the control signal supplied when the removed plug-in unit is remounted and the control circuit 24 is restarted is also supplied to the open control circuit 22 from which the first plug-in unit 23 has been removed. The control signal may be different from the control signal.

In this way, in the above example, the controlled circuit 22 changes from operation B to operation A and then to operation A as the first plug-in unit is removed and remounted. For this reason, for example, when communicating audio signals, there is a possibility that audio interruptions or noise may occur every time the operation of the controlled circuit 22 changes.

In addition, since the operation differs before and after removing the first plug-in unit 23, maintenance work such as replacing the first plug-in unit 23 equipped with the control circuit 24 is required in the case of data communication, for example. In some cases, this may seriously affect the operation of the device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an initial value determining device that can stop and restart the operation of a control circuit without affecting the operation of the controlled circuit.

[Means to solve the problem]

The initial value determination device of the present invention includes (i) a control circuit that outputs a control signal instructing a predetermined operation, (ii) a controlled circuit that performs a predetermined operation in response to the control signal, and (iii) a control circuit. (iv) supply means for continuously supplying the control signal stored in the control signal storage means to the controlled signal; v) Initialization means for making the initial value at the time of restart of the control circuit equal to the control signal stored in the control storage means.

That is, the initial value determining device of the present invention stores the control signal immediately before the control circuit stops operating, and uses the stored control signal as the initial value when the control circuit is restarted.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 is a block diagram showing the configuration of an initial value determining device in an embodiment of the present invention.

The initial value determination device includes a first plug-in unit 31 and a second plug-in unit 31.
The plug-in unit 32 is provided.

The first plug-in unit 31 has a control circuit 33 and an initialization circuit 34. The control circuit 33 supplies a control signal from control terminals 36 and 37 that instructs the second plug-in unit 32 to perform a predetermined operation. Control circuit 33
receives the monitoring signals from two packages performing the same processing as shown in FIG. 4, for example, and outputs a predetermined control signal. The initialization circuit 34 is a circuit for determining the initial value of the control circuit 33 when the first plug-in unit 31 is removed and reinstalled. The initialization circuit 34 is
Just before removing the first plug-in unit 31, the control terminal 3
The control signal output at 6.37 is transferred to the initial value terminal 38.3.
9, and the control circuit 33 is initialized so as to output the same control signal even after reinstallation.

The second plug-in unit 32 includes a storage circuit 41 and a controlled circuit 42 . The memory circuit 41 is equipped with the first plug-in unit 31, and when the control circuit 33 is in operation, the control signals supplied via the control terminals 36 and 37 are directly transmitted to the controlled circuit 42 and the first plug-in unit). 31. On the other hand, the storage circuit 41 includes a detection section (not shown) that detects when the control circuit 33 stops operating or the first plug-in unit 31 is removed. The first plug-in unit is removed, for example, when the control circuit 33 fails for some reason, or when it is replaced because a predetermined period of use has elapsed before the failure. Further, the operation of the control circuit 33 is stopped when, for example, the control circuit 33 and the controlled device 42 have different power sources and are started and stopped at different times. When the storage circuit 41 detects removal of the first plug-in unit 31 or stoppage of the control circuit 33 using a detection section (not shown), the storage circuit 41 stores the immediately preceding control signal using, for example, a latch circuit (not shown). The storage circuit 41 is configured to continuously supply the stored control signal to the controlled circuit.

The controlled circuit 42 performs a predetermined operation in response to a control signal supplied from the memory circuit 41. For example, when supplied from two packages that perform the same process as shown in FIG. 4, the controlled section 42 performs the operation shown in FIG. 5 in response to the control signal.

FIG. 2 shows the circuit configuration of the control circuit 33.

The control circuit 33 includes a first R3 (!J upper set) flip-flop 43 and a second RS flip-flop 44.
It is equipped with The first RS flip-flop 430 set output is connected to the control terminal 36 of the first plug-in unit 31.
The set output of the second RS flip-flop 44 is connected to the control terminal 37.

FIG. 3 shows a circuit configuration of an initialization circuit 34 to which such a control circuit 33 is connected.

The control circuit 33 includes a timer circuit 44 .

The time limit circuit 44 is mounted with the first plug-in unit 31, and outputs "1" for a certain period of time when the control circuit 33 is activated, and thereafter outputs "0".

The timer circuit 44 is connected to one input terminal of the first to fourth Nantes gates 46, 47, 48, 49 each having two input terminals. First Nantes Gate 46
The other input terminal of is connected to the initial value terminal 3'8 of the first plug-in unit 31. The other input terminal of the second Nant gate 47 is connected to the output terminal of the first inversion gate 51, and the input terminal of the first inversion gate 51 is connected to the initial value terminal 38. The other input terminal of the third Nant gate 86 is connected to the initial value terminal 39. The other input terminal of the fourth Nant gate 49 is connected to the output terminal of the second inversion gate 52 , and the input terminal of the second inversion gate 52 is connected to the initial value terminal 39 .

The initialization circuit 34 includes first to fourth AND gates 53, 54, 55, and 56 each having two input terminals. These first to fourth AND gates 53
56 are connected to the output terminals of the first to fourth Nantes gates 46 to 49, respectively, and the other human power terminals are connected to the human power terminals 57 to 60 of the first plug-in unit 31, respectively. It is connected. Monitoring signals are supplied to these input terminals 57-60 from a plurality of packages shown in FIG. 4, for example.

The output terminals of the first AND gate 53 and the second AND gate 54 are connected to the first RS via terminals 66 and 67, respectively.
It is connected to the input terminal of flip-flop 43. Further, the output terminals of the third AND gate 55 and the fourth AND gate 56 are respectively connected to the input terminal of the second RS flip-flop 44 via the terminal 6'8.69.

Next, the operation of the initial value determining device configured as described above will be explained.

The control circuit 33 of this initial value determination device outputs a control signal “0”.
It is assumed that signals 0'', ``01'', ``10'', and ``11'' are outputted, and the controlled circuit 42 performs each operation shown in FIG. 5 in response to each of these control signals.

The first plug-in unit 3 that has already been implemented
For example, the signals "1" and "0" are input to each input terminal 57 to 60 of 1.
It is assumed that "0" and "1" are input manually, and the control circuit 33 outputs a control signal "01". In this case, the control signal "01" is at the control terminal 36.3.
7 to the storage circuit 4 of the second plug-in unit 32
1, and the storage circuit 41 supplies the supplied control signal to the controlled circuit 42 as it is. The controlled circuit 42 is
Operation B corresponding to the supplied control signal "01" is performed.

On the other hand, the control signal "
01''' is also supplied to the first plug-in unit 31. Each of the Nant gates 46 to 49 of the initialization circuit 34 receives a signal "1" or "0" depending on the control signal. Since the signal "0" is supplied from the circuit 44, the signal "1" is always output regardless of the control signal.

Therefore, when the first plug-in unit 31 is installed and the control circuit 33 is operating, the control signal supplied from the storage circuit 41 does not affect the operation of the control circuit 33. That is, since the signal "1" is always supplied to one input terminal of each AND gate 53 to 56, the input terminal 57
The manually inputted signals from 60 to 60 become the signals directly supplied to the control circuit 33.

When the first plug-in unit 31 is removed, the control signal input point of the second plug-in unit 32 appears to be supplied with the control signal "11". However, in the second plug-in unit 32, the memory circuit 41
detects the removal of the first plug-in unit 31 and stores the immediately previous control signal "01". The memory circuit 41 is
Since the control signal "01#" is outputted after removal as well as before removal, the control circuit 42 continues operation B.

Next, a case where the first plug-in unit) 31 is re-implemented will be described.

By reinstalling the first plug-in unit 31, the timer circuit 44 supplies the signal "B" for a certain period of time, so the opening gates 46 to 49 function similarly to inverting gates. Of the control signal “01” which is the same as before the extraction, the control signal “0” supplied through the initial value terminal 38 is inverted to a signal “l” by the first Nant gate 46 and is supplied to the first AND gate 53. In addition, the signal “1” inverted in the first inversion gate) 51 is
” is again inverted to the signal @0'' by the second Nandt gate 47 and supplied to the second AND gate 54. Similarly, the control signal “1” is supplied through the initial value terminal 39.
Accordingly, the signal “0” is input to the third AND gate 55.
The fourth AND gates 56 are each supplied with a signal '1''.

Since the same signals as before the first plug-in unit 31 is removed are supplied from the first to fourth AND gates 53 to 56, the initial value of the control circuit 33 is the same as the control signal “Ol” before the removal. ” becomes.

Therefore, the controlled circuit 42 continues the same operation B as before the first plug-in unit 31 was removed.

In the embodiment described above, the initialization circuit and the storage circuit are arranged in the first plug-in unit and the second plug-in unit, respectively, but the present invention is not limited to this. For example, they can be placed in independent plug-in units. It may be placed in-unit.

〔Effect of the invention〕

In this way, according to the initial value determination device according to claim 1, the control signal immediately before the control circuit stops operating is stored, and the stored control signal is used as the initial value when the control circuit is restarted. Therefore, the operation of the control circuit can be stopped and restarted without affecting the operation of the controlled circuit.

Further, according to the initial value determination device according to the second aspect, since the initialization means is constituted by a gate circuit and a time limit circuit, it becomes possible to constitute it by a simple logic element.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining one embodiment of the present invention, of which Figure 1 is a block diagram showing the configuration of the initial value determining device, and Figure 2 is the circuit configuration of the control circuit. Figure 3 is the circuit diagram of the first plug-in unit.
FIG. 4 is a block diagram of a conventional device configured with plug-in units, and FIG. 5 is an explanatory diagram for explaining the operation of a controlled circuit corresponding to a control signal. 31...First plug-in unit, 32...
...Second plug-in unit, 33...
Control circuit, 34... Initialization circuit, 41...
...Memory circuit, 42...Controlled circuit.

Claims (1)

[Scope of Claims] 1. A control circuit that outputs a control signal instructing a predetermined operation; a controlled circuit that performs a predetermined operation in response to the control signal; and an output immediately before the output of the control circuit stops. control signal storage means for storing the control signal stored in the control signal storage means; supply means for continuously supplying the control signal stored in the control signal storage means to the controlled signal; An initial value determining device comprising: initialization means for making the control signal equal to the control signal stored in the control storage means. 2. The initialization means includes a gate circuit and a time limit circuit that supplies the gate circuit with a logic signal that is inverted from the normal one for a predetermined period of time when the control circuit is restarted, and controls the control signal output from the supply means. 2. The initial value determining device according to claim 1, wherein the initial value is determined by taking in the data from the gate circuit only when the control circuit is restarted.